Shutdown Dask Distributed cluster after everything
Shutdown Dask Distributed cluster after everything

Instead of shutting down the Dask Distributed cluster while still
writing to files, keep it up after finishing writing to files. This
makes it easier to use the Dask Distributed cluster for other things
like prep work before or cleanup after a computation completes.

nanshe-org/nanshe_workflow,DudLab/nanshe_workflow